Delete AS::Dependencies::WatchStack

activesupport/lib/active_support/dependencies.rb

@@ -80,95 +80,6 @@ module ActiveSupport # :nodoc:
     # to allow arbitrary constants to be marked for unloading.
     mattr_accessor :explicitly_unloadable_constants, default: []
 
-    # The WatchStack keeps a stack of the modules being watched as files are
-    # loaded. If a file in the process of being loaded (parent.rb) triggers the
-    # load of another file (child.rb) the stack will ensure that child.rb
-    # handles the new constants.
-    #
-    # If child.rb is being autoloaded, its constants will be added to
-    # autoloaded_constants. If it was being required, they will be discarded.
-    #
-    # This is handled by walking back up the watch stack and adding the constants
-    # found by child.rb to the list of original constants in parent.rb.
-    class WatchStack
-      include Enumerable
-
-      # @watching is a stack of lists of constants being watched. For instance,
-      # if parent.rb is autoloaded, the stack will look like [[Object]]. If
-      # parent.rb then requires namespace/child.rb, the stack will look like
-      # [[Object], [Namespace]].
-
-      attr_reader :watching
-
-      def initialize
-        @watching = []
-        @stack = Hash.new { |h, k| h[k] = [] }
-      end
-
-      def each(&block)
-        @stack.each(&block)
-      end
-
-      def watching?
-        !@watching.empty?
-      end
-
-      # Returns a list of new constants found since the last call to
-      # <tt>watch_namespaces</tt>.
-      def new_constants
-        constants = []
-
-        # Grab the list of namespaces that we're looking for new constants under
-        @watching.last.each do |namespace|
-          # Retrieve the constants that were present under the namespace when watch_namespaces
-          # was originally called
-          original_constants = @stack[namespace].last
-
-          mod = Inflector.constantize(namespace) if Dependencies.qualified_const_defined?(namespace)
-          next unless mod.is_a?(Module)
-
-          # Get a list of the constants that were added
-          new_constants = mod.constants(false) - original_constants
-
-          # @stack[namespace] returns an Array of the constants that are being evaluated
-          # for that namespace. For instance, if parent.rb requires child.rb, the first
-          # element of @stack[Object] will be an Array of the constants that were present
-          # before parent.rb was required. The second element will be an Array of the
-          # constants that were present before child.rb was required.
-          @stack[namespace].each do |namespace_constants|
-            namespace_constants.concat(new_constants)
-          end
-
-          # Normalize the list of new constants, and add them to the list we will return
-          new_constants.each do |suffix|
-            constants << ([namespace, suffix] - ["Object"]).join("::")
-          end
-        end
-        constants
-      ensure
-        # A call to new_constants is always called after a call to watch_namespaces
-        pop_modules(@watching.pop)
-      end
-
-      # Add a set of modules to the watch stack, remembering the initial
-      # constants.
-      def watch_namespaces(namespaces)
-        @watching << namespaces.map do |namespace|
-          module_name = Dependencies.to_constant_name(namespace)
-          original_constants = Dependencies.qualified_const_defined?(module_name) ?
-            Inflector.constantize(module_name).constants(false) : []
-
-          @stack[module_name] << original_constants
-          module_name
-        end
-      end
-
-      private
-        def pop_modules(modules)
-          modules.each { |mod| @stack[mod].pop }
-        end
-    end
-
     def load?
       mechanism == :load
     end